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I know him ______ a good football player while in college.

    A. to have been       B. to be             C. was               D. had been

I know him________a good football player while in college.

A. to have been     B. to be 　　　　　　   C. was 　　　　　　    D. had been

A. to have been     B. to be 　　　　　　   C. was 　　　　　　    D. had been

I know him ______ a good football player while in college.

I know him ________ a good football player while in college.

A．to have been

B．to be

C．was

D．had been